刘亚剑;雷万杉;

• 1:紫金矿业洛宁华泰矿业开发有限公司
• 2:长安大学地球科学与资源学院
• 3:长安大学国土资源部岩浆作用成矿与找矿重点实验室

摘要(Abstract)：

石灰窑花岗岩位于卡拉麦里蛇绿岩带的最东段,岩性为中粗粒钾长花岗岩。岩体具有高硅(74.13%~75.76%)、高钾(4.26%~5.59%)、低镁铁[w(MgO+Fe2O3+TiO2)介于1.55%~3.37%之间]、高A/CNK(0.99~1.12)特征,刚玉标准分子略高(0.003%~1.46%),属高钾钙碱性过铝质S型花岗岩。岩体富钾(K2O/Na2O值介于1.12~2.06之间),高Rb、Cs,低CaO/Na2O值(0.18~0.34之间),显示源区主体为富云母的变泥质岩区。岩石明显富集Rb、Th、U、K和Pb等大离子亲石元素,强烈亏损Ba、Sr、P、Ti、Eu等元素,并具有弱的Nb亏损,具有俯冲相关的火山弧和后碰撞伸展花岗岩类的地球化学特征。岩体侵位于下石炭统山梁砾石组地层,南界被蛇绿混杂岩的边界断裂切割,岩体LA-ICP-MS锆石U-Pb年龄(282.9±3.6)Ma应代表了卡拉麦里蛇绿混杂岩带东段的闭合年龄。结合区域构造背景分析,石灰窑花岗岩形成于卡拉麦里俯冲碰撞向碰撞后伸展的过渡阶段,是局部减压和地幔热流异常导致上地壳物质发生部分熔融的产物。

关键词(KeyWords)： 石灰窑S型花岗岩;LA-ICP-MS锆石U-Pb定年;东天山;卡拉麦里蛇绿岩带

Abstract:

Keywords:

基金项目(Foundation): 长安大学中央高校基本科研业务费项目(2014G1271067,310827153408,310827151057)

作者(Author): 刘亚剑;雷万杉;

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DOI:

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